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seraphim [82]
3 years ago
7

The condition Marfan syndrome results from the production of abnormal elastin, the main protein component of elastic fibers. Pre

dict the potential consequences of defective elastic fibers. (Hint: Consider the organs and tissues in which elastic fibers are found). How would defective elastic fibers impair the functions of these organs and tissues?(
Biology
1 answer:
Marina86 [1]3 years ago
4 0

Answer:

Elastic fibers are made of elastin and microfibrils, that are elastic protein structures. The proteins can be stretched and resume normal shape. These fibers are found in parts of the body such as arteries, skin, lungs, connective tissue and heart that require some stretching. Marfan syndrome affects the elastic connective tissues causing symptoms like dilation of the aorta that doesn't resume normal lumen diameter (aortic aneurysm), and curving of the spine (scoliosis).

The lungs are unable to stretch and resume shape normally and this affects the respiratory system. The subjects will suffer from shortness of breath, wheezing and chest pain.

The sheath/endoneurium of neurons is connective tissue. This part of a neuron allows signals to travel effeciently along the axon of the neuron. This means that a person with Mafran syndrome has a slower response to stimuli that ordinary persons.

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How are monotremes different from other groups of mammals?
fredd [130]

Answer:

The correct answer will be -they lay eggs

Explanation:

Monotremes are the animals which belong to the group of mammals. There are only five species of monotremes known today which are found in New Guinea and Australia.

The monotremes differ from other mammals which is that they lay eggs instead of giving birth to the young ones. This shows that these mammals are closely related to the reptiles and amphibians and are thus the primitive mammals.

Thus, they lay eggs is the correct answer.

3 0
3 years ago
2. Which of the following is an inference?
svetlana [45]

Answer:

D. You believe it rained when you see a mud puddle.

Explanation:

A. is incorrect because an inference is an educated guess, and counting 43 tree rings is a conclusion.

C. is also incorrect because you found the temperature with a thermometer, there was no inference made before checking it.

B. is incorrect; inferences are based on past experiences/knowledge, which looking through a telescope at craters on the moon is not doing. It does not disclose other means of reaching the conclusion.

D. is correct. Using skills of observation, you infer that the mud puddle could have been caused by rain.

6 0
2 years ago
Classify the given terms or examples with the appropriate category.
atroni [7]

Answer:

a. general stimulus origin: Proprioceptors, Exteroreceptors, Interoceptors

b. special modality of stimulus:  Baroreceptors, Chemoreceptors Thermoreceptors

Explanation:

The sensory modality of stimulus refers to the aspect of a stimulus, and the sensation that is felt after a stimulus has had effect. Different sensory modalities include, temperature(thermoreceptors), light, chemicals(chemoreceptors), pressure(baroreceptors), and sound.

Stimulus origin is a classification system of receptors that indicates where a stimulus stems from. Exteroreceptors detect stimuli from the external environment and an example is the receptors found in the nasal cavity. Interoceptors are found in the internal organs and typically affect the smooth muscles of these organs. Proprioceptors are found in muscles, joints and tendons.

3 0
3 years ago
Ionic compounds form ions in water.<br> True?<br> False?
krok68 [10]

Answer:

True

Explanation:

For example, NaCl - sodium chloride, when  dissolved in water forms Na+ and Cl- ions.

4 0
3 years ago
How does sand silt and Clay affect soil nutrients and plants
Ghella [55]
Sand is granular and coarse meaning that water and nutrients can flow through it quite easily. Clay on the other hand has very fine particles that cling together to form a waterproof substance which traps/ stops any nutrients or water from moving down. Clay's also quite difficult for plants to get their roots into. Silt has a texture between clay and sand, meaning that it is the ideal substance as it allows the best water and nutrition movement in the soil. Most plants will grow best in silt, but there are some plants who are more adapted to living in sand (e.g. Marram grass) or clay.
6 0
3 years ago
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